with a short plastic tube. This providespulse pressure to drive the carburetor’sdiaphragm pump. Very similar to a Walbrounit, the RCGF carburetor is equippedwith a choke and the main throttle valveis spring-loaded in the shut position. A setof high- and low-end needle valves andan idle adjustment screw are all standardissue and the carburetor is slightly angledso the throttle pushrod is a straight shotback to the servo requiring no complicatedlinkage.

By coincidence, the 40T has the exact
same prop bolt pattern as a DLE 55cc
engine and so, to drill the four bolt holes,
I was able to use the prop hub drilling
guide I already had. To make the testing
a bit easier, I installed a Tru- Turn Bullet
spinner ( truturn.com) so I could safely
use my Sullivan Dyna Tron starter
( sullivanproducts.com) to fire up the
engine. After a few runs however, I found
that the engine was very easy to start by
hand-flipping the propeller.

test runs

For the review, I used several propeller
brands including both composite and
wood Master Airscrew, Falcon and
Xoar propellers ( masterairscrew.com,
falconpropellers.com, xoarintl.com). Some
props needed to be reamed and then all
were tweaked on my Du-Bro balancer
( dubro.com). The recommended propeller
size is 20 x 10, so I included sizes on either
side of the target figure to see what the
rpm numbers and sound levels looked
like. For fuel I used the recommended 30:1
mix using Honda HP2 synthetic 2-stroke
engine oil and regular gasoline.

either side of the exhaust port.

Positioned on the bottom of the engine
case between the two exhaust ports, the
intake assembly is a quad-reed design
with a molded plastic housing supporting
and isolating the carburetor from the heat
of the engine. Separated from the engine
case, the carburetor is equipped with a